Xiao Chunhua, a veteran director of discipline at a school, dies suddenly from overwork and transmigrates into the love-struck Eldest Princess Duan Su of the Great Sheng Dynasty. For twenty years, the original princess has lived in humiliation, exploited by her husband, his concubines, and her mother-in-law, while her children have all been turned against her. Armed with a teaching whip, she takes charge of the princely residence and reforms it, educating each child according to their individual needs. Joining forces with Imperial Brocade Guard Lin Zhao, she investigates an old imperial examination case and uncovers Prince Li's conspiracy to rebel. After trying cases at court and putting down a palace coup, she finally settles into a teaching position at the Imperial Academy and spends the rest of her life with Lin Zhao.